Danville weather in January

In January, Danville sees average daytime highs of 57°F and overnight lows near 42°F, with 3.5 in of rain across 9 wet days and about 9.7 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 57°F through the month. The sky is clear or mostly clear about 32% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 24 min at the start of January to 10 hours by month's end. Set against the rest of the year, January is Danville's 12th-clearest and 10th-windiest month. For the whole year in context, see Danville's year-round climate.

Daytime high
57°
11th warmest
Overnight low
42°
2nd coldest
Rainfall
3.5 in
9 wet days
Daylight
9 h 42 min
7:28 AM – 5:07 PM
Cloud cover
59%
12th clearest
Wind
4 mph
10th windiest
Solar energy
2.41 kWh/m²
Travel score
4.2
out of 10

Danville is incorporated town in Contra Costa County, California, United States.

Density
951/km²
people per km²
Founded
1982

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 57°F through the month.

A typical January day in Danville reaches about 57°F in the afternoon and slips back to 42°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 52°F and 62°F. Set against its neighbours, January runs on par with December and about 3°F cooler than February.

30°40°50°60°70°151015202531
Avg high (°F)Avg low (°F)
15640
25641
35641
45641
55641
65641
75641
85641
95641
105641
115641
125641
135641
145741
155742
165742
175742
185742
195742
205742
215742
225742
235842
245842
255842
265842
275842
285842
295842
305942
315942

Danville weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 42°3.599.74.2
Feb60° / 43°3.78.910.54.9
Mar63° / 45°2.88.411.76.0
Apr67° / 47°1.34.812.97.1
May72° / 51°0.73148.2
Jun77° / 54°0.10.914.69.1
Jul80° / 57°0.00.214.49.0
Aug80° / 57°0.10.213.59.0
Sep79° / 55°0.10.412.39.0
Oct74° / 52°0.82.9118.6
Nov64° / 46°1.65.5106.4
Dec57° / 42°3.28.79.44.2

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24456
34456
44456
54456
64357
74357
84357
94456
104357
114456
124456
134555
144456
154555
164555
174555
184555
194555
204555
214555
224555
234555
244555
254555
264654
274654
284654
294753
304753
314753

Chance of precipitation in January

Any precipitation

Danville gets around 3.5 in of rain over 9 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
227
327
427
528
628
728
828
928
1028
1128
1229
1329
1429
1530
1630
1730
1830
1931
2031
2130
2230
2330
2430
2529
2629
2729
2828
2928
3028
3127

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
211000
221000
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in January

Winds average 4 mph in January.

Across January, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 24 min at the start of January to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over January. Sunrise moves from 7:28 AM to 7:20 AM, and sunset from 4:54 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.47:284:54
29.47:294:55
39.47:294:55
49.57:294:56
59.57:294:57
69.57:294:58
79.57:294:59
89.57:294:59
99.57:295:00
109.57:295:01
119.67:295:02
129.67:295:03
139.67:285:04
149.67:285:05
159.67:285:06
169.77:285:07
179.77:275:08
189.77:275:09
199.77:275:10
209.77:265:11
219.87:265:12
229.87:265:13
239.87:255:14
249.87:255:15
259.97:245:16
269.97:235:17
279.97:235:18
2810.07:225:19
2910.07:225:20
3010.07:215:21
3110.07:205:23

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.41 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 8.04 kWh/m² in June across the year — January's 2.41 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.3Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.4Moderate
152.4Moderate
162.4Moderate
172.4Moderate
182.5Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.5Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.7Moderate
272.7Moderate
282.7Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in January

Is January a good time to visit Danville?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.2
Sightseeing
11th-best month of the year
0.0
Beach & pool
12th-best month of the year

January is a reasonable time to visit Danville for sightseeing.

What to pack for Danville in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Danville sees daytime highs around 57°F and nights near 42°F. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Danville in January

The nearest coast averages about 53°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 34 mi away) is warmest in September at about 58°F and coldest in April near 53°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

52°54°56°58°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan53Bracing
Feb53Bracing
Mar54Bracing
Apr53Bracing
May53Bracing
Jun54Bracing
Jul56Bracing
Aug58Bracing
Sep58Bracing
Oct57Bracing
Nov55Bracing
Dec54Bracing

UV index in Danville in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Danville peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 23UV 10Dec 15UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun10Very high
Jul10Very high
Aug10Very high
Sep6High
Oct5High
Nov2Moderate
Dec2Low

Air quality in Danville in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Danville is worst in August — around 25 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (June, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateAug 1824 µg/m³Jun 1110 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar16Moderate
Apr12Moderate
May10Good
Jun10Good
Jul11Good
Aug25Moderate
Sep17Moderate
Oct20Moderate
Nov18Moderate
Dec13Moderate
Location & terrain

Where is Danville?

Danville sits at 37.8°N, 122.0°W, 358 ft above sea level, in United States. The nearest listed city is San Ramon, 3.1 mi away.

Topography around Danville

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Danville.

Within 2 miles, the terrain around Danville has significant variations in elevation — a maximum elevation change of 1,453 ft around an average of 620 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,776 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.

The land around Danville is covered by trees (62%) and grassland (20%) within 2 miles, trees (46%) and grassland (36%) within 10 miles, and grassland (28%), trees (25%) and water (20%) within 50 miles.

2 miles
1,453 ft
10 miles
3,776 ft
50 miles
4,452 ft
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
January weather nearby: San Ramon 3.1 mi · Walnut Creek 6.8 mi · Moraga 6.8 mi · Lafayette 8.1 mi · Dublin 8.7 mi · Pleasant Hill 9.3 mi · Castro Valley 9.9 mi · Orinda 11 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Danville (37.8216°, -122°, elevation 358 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).